|
| Immobilizing effects of calcium-based agents on soil contaminated by vanadium ore |
| Received:September 22, 2015 |
| View Full Text View/Add Comment Download reader |
| KeyWord:heavy metal pollution;calcium-based immobilizing agent;vanadium;chromium |
| Author Name | Affiliation | E-mail | | DING Xu-tong | School of Environment, Tsinghua University, Beijing 100084, China
College of Life Science and Technology, Harbin Normal University, Harbin 150025, China | | | JIANG Jian-guo | School of Environment, Tsinghua University, Beijing 100084, China
Key Laboratory for Soil Waste Management and Environment Safety, Ministry of Education, Beijing 100084, China | jianguoj@mail.tsinghua.edu.cn | | LI De-an | School of Environment, Tsinghua University, Beijing 100084, China | | | LI Tian-ran | School of Environment, Tsinghua University, Beijing 100084, China | | | WANG Jia-ming | School of Environment, Tsinghua University, Beijing 100084, China | |
|
| Hits: 2608 |
| Download times: 2582 |
| Abstract: |
| There are not many investigations available regarding the remediation of vanadium(V)-contaminated soil. Here three calcium-based immobilizing agents, i.e. calcium oxide, calcium chloride, and hydroxyl-apatite, were employed to investigate their immobilizing effects on V-contaminated soil. Results showed that the efficiency of different agents for immobilizing V exhibited in order of calcium oxide> calcium chloride> hydroxyl-apatite, at a rate of 0.5%, 1%, and 2%, respectively, under neutral-pH conditions. Calcium oxide showed a better immobilizing efficiency for Cr than calcium chloride and hydroxyl-apatite did. In acidic conditions, calcium oxide was still better in immobilizing V than calcium chloride and hydroxyapatite were. Calcium oxide and calcium chloride increased Cr immobilization, but hydroxyapatite promoted Cr leaching under acidic conditions. After 14 d of treatment, the immobilizing efficiencies did not change over time. The releases of other V-accompanied heavy metals, i.e. Cd, Cu, Pb, and Zn, were reduced by all three agents at all rates, expect calcium chloride at 2%. Applying calcium oxide at 2% immobilized V and Cr by 99.0% and 38.6%, respectively, after a 3-h. In calcium oxide treatment, soil residual V was 22.9%, which increased by 76.2% as compared to the untreated soil. |
|
|
|
